i have the same issue.
my android auto will only "listen" to me after i first play music through it.
otherwise, it just sits there "listening" and doing nothing after i say ok google.
so everytime after i start the car and launch AA, i hit play & then pause and change to radio/media, or leave it to play spotify.
this way AA is ready for my ok google commands.
i've tried looking around in settings and stuff, but no luck.
i think its some weird handshake thing between the Columbus unit and Android Auto.
i have a HTC U11 phone, running Android 9.
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